초록 ▼

Method, system, and apparatus for evaluating hemodynamic parameters and, in particular, cardiac output. A pulmonary artery catheter is described which incorporates a diffuser of gas biocompatible with the body such as oxygen at an indwelling region such that the gas may be employed to carry out a di

Method, system, and apparatus for evaluating hemodynamic parameters and, in particular, cardiac output. A pulmonary artery catheter is described which incorporates a diffuser of gas biocompatible with the body such as oxygen at an indwelling region such that the gas may be employed to carry out a dilution technique to measure cardiac output. A mixed venous blood gas level then is measured at the pulmonary artery using a gas sensor. The preferred gas sensor employs oximetry to derive values of mixed venous oxygen saturation. An alternate embodiment utilizes an electrode/electrolyte approach as the gas sensor to carry out measurement of dissolved oxygen in mixed venous blood. The system utilizes a microprocessor driven controller to develop multiple evaluations over sequential measurement intervals and to compute a variety of hemodynamic parameters including the noted cardiac output.

대표청구항 ▼

[ I claim:] [1.] Apparatus for evaluating the hemodynaric state of the cardiovascular system of the body of a patient, comprising:a pulmonary artery catheter having a distal end positionable within mixed venous blood at the pulmonary artery of said body and an indwelling region spaced rearwardly the

[ I claim:] [1.] Apparatus for evaluating the hemodynaric state of the cardiovascular system of the body of a patient, comprising:a pulmonary artery catheter having a distal end positionable within mixed venous blood at the pulmonary artery of said body and an indwelling region spaced rearwardly therefrom, said catheter extending to a proximal end;a diffusion channel within said catheter having a gas input connectable with a controlled source of gas biocompatible with said body and extending to an infusion component located at said indwelling region and configured for infusing said gas into the bloodstream of said body; anda gas sensor component mounted upon said catheter at said distal end and having an output corresponding with a level of said biocompatible gas within said mixed venous blood.